7,8-dihydro-5-phenyl-1,3-dioxolo[4,5-g]isoquinoline 、 6,7-Ethylenedioxy-1-phenyl-3,4-dihydroisoquinoline 、 以there detailed affords 6,7-methylenedioxy-1-phenyl-1,2,3,4-tetrahydroisoquinoline, melting at about 94°-96°C., or 6,7-ethylenedioxy-1-phenyl-1,2,3,4-tetrahydroisoquinoline, melting at about 89°-91°C.的产率得到5-phenyl-5,6,7,8-tetrahydro-[1,3]dioxolo[4,5-g]isoquinoline